Caulking tool



FIG. 1 is front view of my new design for a caulking tool;

FIG. 2 is a back view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a caulking tool, as shown and described. 